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## Current Electricity

### Physics

#### Previous Years Questions

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A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as sho...
NEET 2022
A capacitor of capacitance C = 900 pF is charged fully by 100 V battery B as shown in figure (a). Then it is disconnecte...
NEET 2022
A copper wire of length 10 m and radius $$\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$$ m has electrical resi...
NEET 2022
Two resistors of resistance, 100 $$\Omega$$ and 200 $$\Omega$$ are connected in parallel in an electrical circuit. The r...
NEET 2022
Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio $${{{i_3}} \over... NEET 2021 The equivalent capacitance of the combination shown in the figure is :... NEET 2021 The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-secti... NEET 2021 In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V... NEET 2021 A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V = V0sin$$\omega$$tThe displace... NEET 2021 A parallel plate capacitor has a uniform electric field$$\overrightarrow E $$in the space between the plates. If the d... NEET 2021 The solids which have the negative temperature coefficient of resistance are : NEET 2020 Phase 1 Which of the following graph represents the variation of resistivity ($$\rho $$) with temperature (T) for copper? NEET 2020 Phase 1 A charged particle having drift velocity 7.5$$ \times $$10-4 ms-1 in an electric field of 3$$ \times $$10-10 Vm-1 has a ... NEET 2020 Phase 1 The color code of a resistance is given below : The values of resistance and tolerance, respectively, are... NEET 2020 Phase 1 A resistance wire connected in the left gap of a metre bridge balances a 10$$\Omega $$resistance in the right gap at ... NEET 2020 Phase 1 Which of the following acts as a circuit protection device? NEET 2019 In the circuits shown below, the readings of voltmeters and the ammeters will be : ... NEET 2019 Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance. The ra... NEET 2019 A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. Th... NEET 2018 A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in ... NEET 2018 A carbon resistor of (47$$ \pm $$4.7) k$$\Omega $$is to be marked with rings of different colours for its identificat... NEET 2018 A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves NEET 2017 The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance ... NEET 2017 The charge flowing through a resistance R varies with time t is Q = at$$-$$bt2, where$$a$$and$$b$$are positive con... NEET 2016 Phase 1 A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it work... NEET 2016 Phase 2 A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected... NEET 2016 Phase 1 The potential difference (VA$$-$$VB) between the points A and B in the given figure is ... NEET 2016 Phase 2 A potentiometer wire has length 4 m and resistance 8$$\Omega $$. The resistance that must be connected in series with t... AIPMT 2015 Cancelled Paper A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential differe... AIPMT 2015 Cancelled Paper A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance... AIPMT 2015 Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which ... AIPMT 2015 Cancelled Paper A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has... AIPMT 2015 Two metal wires of identical dimensions are connected in series. If$$\sigma $$1 and$$\sigma $$2 are the conductivity o... AIPMT 2015 Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of pote... AIPMT 2014 A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used acro... AIPMT 2014 The resistances in the two arms of the meter bridge are 5$$\Omega $$and R$$\Omega $$respectively. When the resistance... AIPMT 2014 Ten identical cells connected in series are needed to heat a wire of length one meter and radius 'r' by 10oC in time 't'... NEET 2013 (Karnataka) A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure. Th... NEET 2013 (Karnataka) Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is... NEET 2013 (Karnataka) A wire of resistance 4$$\Omega $$is stretched to twice its original length. The resistance of stretched wire would be NEET 2013 The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10$$\Omega $$is NEET 2013 The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectiv... NEET 2013 A cell having an emf$$\varepsilon $$and internal resistance r is connected across a variable external resistance R. As... AIPMT 2012 Mains The power dissipated in the circuit shown in the figure is 30 watts. The value of R is ... AIPMT 2012 Mains If voltage across a bulb rated 220 volt-100 watt drops by 2.5% of its rated value, the percentage of the rated value by ... AIPMT 2012 Prelims A ring is made of a wire having a resistance R0 = 12$$\Omega $$. Find the points A and B, as shown in the figure, at wh... AIPMT 2012 Prelims In the circuit shown the cells A and B have negligible resistances. For VA = 12 V, R1 = 500$$\Omega $$and R = 100$$\...
AIPMT 2012 Prelims
A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanomete...
AIPMT 2011 Mains
In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is ...
AIPMT 2011 Mains
If power dissipated in the 9 $$\Omega$$ resistor in the circuit shown is 36 watt, the potential difference across the 2...
AIPMT 2011 Prelims
A current of 2 A flows through a 2 $$\Omega$$ resistor when connected across a battery a 2 $$\Omega$$ resistor when co...
AIPMT 2011 Prelims
A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the ...
AIPMT 2010 Prelims
Consider the following two statements. (A)&nbsp;&nbsp;Kirchoff's junction law follows from the conservation of charge. ...
AIPMT 2010 Prelims
A student measures the terminal potential difference (V) of a cell (of emf $$\varepsilon$$ and internal resistance r) a...
AIPMT 2009
The mean free path of electrons in a metal is 4 $$\times$$ 10$$-$$8 m. The electric field which can give on an average...
AIPMT 2009
A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two...
AIPMT 2009
See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ? ...
AIPMT 2009
A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circui...
AIPMT 2008
A current of 3 amp. flows through the 2 $$\Omega$$ resistor shown in the circuit. The power dissipated in the 5 $$\Omeg... AIPMT 2008 An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20oC ? ... AIPMT 2008 A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respe... AIPMT 2008 In the circuit shown, the current through the 4$$\Omega $$resistor is 1 amp when the points P and M are connected to ... AIPMT 2008 The total power dissipated in watt in the circuit shown here is ... AIPMT 2007 Three resistances, P, Q, R each of 2$$\Omega $$and an unknown resistance S from the four arms of a Wheatstone bridge ci... AIPMT 2007 Power dissipated across the 8$$\Omega $$resistor in the circuit shown here is 2 watt. The power dissipated in watt uni... AIPMT 2006 Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistan... AIPMT 2006 Kirchoff's first and second laws of electrical circuits are consequences of AIPMT 2006 In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will ... AIPMT 2006 A 5-ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is AIPMT 2005 For the network shown in the figure the value of the current$$i$$is ... AIPMT 2005 When a wire of uniform cross-section$$a$$length$$l$$and resistance R is bent into a complete circle. resistance betw... AIPMT 2005 Two batteries, one of emf 18 volts and internal resistance 2$$\Omega $$and the other of emf 12 volts and internal resi... AIPMT 2005 A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 oh... AIPMT 2004 Resistance n, each of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances we... AIPMT 2004 In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W ... AIPMT 2004 The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then AIPMT 2004 when three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by ... AIPMT 2004 Five equal resistances each of resistances R are connected as shown in the figure. A battery of V volts is connected bet... AIPMT 2004 An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle ... AIPMT 2003 In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R,... AIPMT 2003 Fuse wire is a wire of AIPMT 2003 Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected... AIPMT 2003 Specific resistance of a conductor increases with AIPMT 2002 For a cell terminal potential difference is 2.2V when circuit is open and reduce to 1.8 V when cell is connected to a re... AIPMT 2002 If specific resistance of a potentiometer wire is 10-7$$\Omega $$m and current flow through it is 0.1 amp., cross-secti... AIPMT 2001 Copper and silicon is cooled from 300 K to 60 K , the specific resistance AIPMT 2001 The resistance of each arm of the Wheatstone's bridge is 10 ohm. A resistance of 10 ohm is connected in series with a ga... AIPMT 2001 The potentiometer is best for measuring voltage, as AIPMT 2000 Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistances AIPMT 2000 A car battery of emf 12 V and internal resistance$$5 \times {10^{ - 2}}\Omega ., receives a current of 60 amp, f...
AIPMT 2000
The net resistance of the circuit between A and B is ...
AIPMT 2000

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